Klis Fortress is a small medieval stronghold near Split, Croatia. The fortress dates back to the 7thcentury. Though it started as a small stronghold, it developed into a royal castle and eventually a large fortress during the Ottoman wars. Throughout history, it has been the seat of many Croatian rulers. It served as a crossroads between the Balkans and the Mediterranean, and as a result, it was often under attack. The fortress was conquered several times by the Ottomans, Venetians and Austrians.
The fortress consists of three sections, each with its own entrance. Many of the newer buildings have been completely or partly preserved. Several sections of Klis Fortress were used as inns which were used for isolation during epidemics, protecting Split from diseases in other regions. Today it is a museum where visitors can learn about the military history of the fortress. The fortress was also used in the filming of several episodes of the television series Game of Thrones.